This question is about water - AQA - GCSE Chemistry - Question 2 - 2020 - Paper 2
Question 2
This question is about water.
In the UK, potable (drinking) water is produced from different sources of fresh water.
Explain how potable water is produced from fres... show full transcript
Worked Solution & Example Answer:This question is about water - AQA - GCSE Chemistry - Question 2 - 2020 - Paper 2
Step 1
Explain how potable water is produced from fresh water.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Potable water is produced from fresh water through several steps. First, raw water is sourced from rivers, lakes, or boreholes. This water then goes through a filtration process where solid impurities are removed. Next, the water must be sterilized to eliminate harmful microorganisms, typically using chlorine, ozone, or ultraviolet light. Finally, the treated water is stored in reservoirs before distribution to households.
Step 2
Suggest one process this country could use to obtain most of its potable water.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One viable process for this country could be desalination, which involves removing salt from seawater to make it suitable for drinking.
Step 3
Draw one line from each substance to the way the substance is processed.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
From the table, the mass burned in 2010 is 260 million kilograms, and the total mass is 1413 million kilograms.
Substituting in the values:
ightarrow 18.4 ext{%} $$
Step 5
Suggest one reason why the total mass of processed solid sewage sludge increased between 1992 and 2010.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One reason for the increase in the total mass of processed solid sewage sludge could be the growing population, which in turn leads to more waste production.
Step 6
Suggest two reasons why the proportion of processed solid sewage sludge used as fertiliser increased.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Increased demand for food due to a larger population.
Greater awareness of the environmental benefits of recycling waste products as organic fertilisers.
